20385458 has 4 divisors (see below), whose sum is σ = 30578190. Its totient is φ = 10192728.

The previous prime is 20385457. The next prime is 20385473. The reversal of 20385458 is 85458302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14417209 + 5968249 = 3797^2 + 2443^2 .

It is not an unprimeable number, because it can be changed into a prime (20385457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5096363 + ... + 5096366.

Almost surely, 2^20385458 is an apocalyptic number.

20385458 is a deficient number, since it is larger than the sum of its proper divisors (10192732).

20385458 is a wasteful number, since it uses less digits than its factorization.

20385458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10192731.

The product of its (nonzero) digits is 38400, while the sum is 35.

The square root of 20385458 is about 4515.0258028056. The cubic root of 20385458 is about 273.1745005558.

The spelling of 20385458 in words is "twenty million, three hundred eighty-five thousand, four hundred fifty-eight".